When buying running shoes to maximize your workout and prevent injuries, arch support is the first order of priority. Each person has a unique foot type, just like a fingerprint. This type is defined by the shape of the main arch on the foot, along with the extent of pronation, or inward rolling of the foot upon impact with the ground. The best way to prevent fatigue and hyperextension, then, is to relieve some of the pressure supported by the main arch of the foot.